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Class 12BiologyEnvironmental IssuesWater Pollution and Its Control
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What is the percentage of impurities in domestic sewage that makes it unfit for human use (in $\%$)?

  • A
    $0.1$
  • B
    $99.9$
  • C
    $10$
  • D
    $90$
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Class 12 Questions

Class 12

Biology Questions

Chapter

Environmental Issues

Subtopic

Water Pollution and Its Control

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